pauly99
There is something seriously wrong with your approach here.
I have a strong aversion to using ANY abrasive on a rubber belt. For a start, genuine Connoisseur belts are of precision diameter. Use of any abrasive will compromise the precision and may affect turntable performance- if not immediately then in the long run.
There is absolutely no point in degrading the precision of the belt by using emery cloth on it, thereby creating irregularities on its surface. Moreover, some of the abrasive will, no doubt, get into the belt groove on the platter and could grind in and affect its shape in due course. This to say nothing of limiting the life of the belt.
Your suggestion that roughing up the surface of the belt could have cured all or some of what you call wow is one I reject as being so unlikely as to be unworthy of serious consideration. It is more likely that what you have done would cause wow. I am beginning to think that much of what you hear is imaginary or due to psychological factors.
T&G is a reputable firm with many years of successful trading. They would not sell you a belt that would slip from day 1. Did you get a genuine T&G belt or from some other source?
There is no question of a new belt slipping on a properly set up BD1. I assume that one has used common sense and not done anything to enhance the possibility of slippage- such as lubricate the belt or the belt groove. It is desirable to keep the belt groove clean and free from contaminants. Doing so will eliminate unwarranted slippage.
I suggest that your best plan is to wash your belt in detergent and also wash the platter belt groove. Order a new T&G belt and keep your imprecise (emery treated) one as a spare for dire emergencies. You have to be very careful to wash off all the detergent and hope that no emery abrasive will find its way onto the spindle. If it does, or finds its way into the bearing, you are headed for trouble.
It would be better for you to follow T&Gs advice and use the silicone belt dressing they sell- every three years or so; sparingly. This is what I do.
I cannot help noticing that each and every time you venture into another step you create more problems for yourself that could have been avoided ,quite easily, by either enquiring before you do it or doing only what has been tried and tested.
So far you have displayed many more problems for us to try to assist you to resolve than any other contributor to this thread has done or, I suspect, is ever likely to do.